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Ddr2 1066 frequency issue

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September 26, 2011 1:23:52 PM

Hello, I have just ungraded the memory in my rig from 2 Gb of pc6400 to 4 Gb (2x 2gb sticks) of pc8400 1066 but the bios is still reporting it as pc6400 (400mhz).
The board is a Gigabyte GA-EP31-DS3L. I cleared the cmos AND updated the bios but still getting same results. There is a note @ the side of the bios about 1066 strapping, but i cant seem to change it. Help pls, i've been at this for 4 hours now :( 

a b V Motherboard
September 26, 2011 2:55:34 PM

Well 1066 ram is basicly overclocked 800 ram so you have to go into bios and set the timmings by hand. Go to the memory section of your BIOS and copy all the timing info off your ram or the box Will look something like 7-7-7-18 or something I just made that up. Once you hard code it all in it will be running as it should.

T
a b V Motherboard
September 26, 2011 3:46:52 PM

Your memory runs at 800mhz unless your overclocking.

400mhz x 2 (DDR-double data rate) = 800mhz
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September 26, 2011 3:51:49 PM

thently said:
Well 1066 ram is basicly overclocked 800 ram so you have to go into bios and set the timmings by hand. Go to the memory section of your BIOS and copy all the timing info off your ram or the box Will look something like 7-7-7-18 or something I just made that up. Once you hard code it all in it will be running as it should.

T

Thanks Thently, i've just got it up and runnung again and cpuz is reporting the dram frequency @ 555mhz which is correct, fsb @ 1332mhz (333x9.5) but the spd still says its pc2 6400 memory 400mhz ??? if the jdec is reporting wrong my timings (on auto) could be way off.

Im pretty new to this ocing thing, i was wondering if I have overlooked something or im jut doing it plain wrong :??: 

ga-ep31-ds3l board
intel core 2 duo 2.53 (3.16ghz)
gtx8800
win7
4gb kingston pc2-8500 ddr2
a b V Motherboard
September 26, 2011 4:19:48 PM

SPD is the programmed default BOOT frequency in the DIMM. It is not the frequency that the RAM is currently running at. When you click on the Memory tab in CPU-Z it shows the frequency and RAM timings that are being used at the moment.
a b V Motherboard
September 26, 2011 4:55:13 PM

If cpu-z says 550mhz, then it's running at 1110mhz. You have your memory overclocked because you raised your cpu's fsb.

Unlink the cpu/fsb or change the dimm ratio so that when you raise your fsb, it doesn't raise your memory speed. Set ratio so that ram stays at 533 (x2=1066) or less.

If you have good memory with heatsinks, your probably ok at 1110. If not, it may overheat and fail at some point.
September 26, 2011 9:25:37 PM

hmm, the memory is kingston KHX8500D2K2/4G... with heatspreaders, think I might be ok, really not happy about the 3:5 divider though.

System is stable though @ 3.16ghz. Memory clock @ 1111 (!!)
I still dont understand how or if I can impliment the 1066 strapping. 800mhz strapping is still highlighted in the bios.
a b V Motherboard
September 27, 2011 5:07:34 PM

What do you mean implement 1066? You just said your running at 1111..........

The only way you can bring it back to 1066 is lower fsb or change ratio. I though I already made that clear.
!